Sheet metal brake



s. BOWMAN SHEET METAL BRAKE Filed May 2a, 1940 Aug. 3, 1943.

3 Sheets-Sheet 1 Aug. 3, 1943. s. BOWMAN SHEET METAL BRAKE Filed May 28, 1940 '3 Sheets-Sheet 2 m Samuel Bowman ATTORNEY.

Aug. 3, 1943. BOWMAN SHEETIME'IJAL BRAKE Fil ed May 28, 1940 ,S Shee tS-Sheet 3 INvEmoR. Sam d Ban 7220a fyjl.

.P nt Augl3,1943

brake mem r mellibrs,

showihg means .Twelf th, w rovide asheetmetal rake of this I a class which the-motof driving fmea iafls auto: matipally remains QpemtiVeIy disconnecfiecti the brake' memblywhn' the clamp membrggu e y inf dpn position;

Figf? is a frag parts and portions throughout the Y ofthe drawings. I I I The frame members i and 2, stationaryeiamp member 3; shiitable clamp member 4, brake mem ber 5, brake member rocker arms 5, roeker arm f bearings l and '3, rocker arm gear-racks d, rocker,

'my sheet metalgbrake; I I 1 The; ame m mbers! nd? ar s s an al y fiat, plate likemembersand are secureditogether in spaced relation with each otherby meansof moldings orethe like; Fig. 8 isan enlarged fragmentary sectional view taken fromthe line 8-3 ofFig. 2g'Fig. 9 is an enlarged fragmentary View Showing a modified form'of the clamp and brake member of my sheet metal I brake; i is a similar viewto Fig. 9 showing a part of the brake member in inverted relation comparatively with the part as shown in'Fig. 9 of the drawings and Fig. 11 is an enlarged'fragmentary front elevational view of the modified structure asshown in Figs. Sand 19 of the drawings. I

Similar characters of reference refer'to similar arm operating gears i0, operating gearcontrol I "members t i2, is and as, latch membersfifi and I5, vclamp member operating lev rs H. l 8,] clamp; member operating I link i 53, fastening members 253 and 2!, fasteningm II control lever 2.2,latch member control le /er E3,

. I controlshafts 24 and 25;, motor motor-shafts I 21, clamp member adjusting levers 28.- an dV ZS, 'eccentric-pin 38, metal supporting member ti, 7

gear disengaging member 33; andlthe rocker ar'm oiip memherjd and portions I oimolding form member 32,

constitute the principal par thebo t rla' and c acers b whi sp e s views 7 clampmember 4. Secured on the tubular mem-' ber 41) in opposed relation with the clamp portion 4a are track members 40 which are arranged to support the pan forming clamp members M in interlocked relation, asshown in Fig. 2 of the drawings, it being noted that these pan forming clamp portions 4d are longitudinally shiftable on the track memberslc. Centrally mounted in opposite endsof the tubular member 4b are journal members As which are. revolubly positioned onjthe bolt .4J,.all as shown best in'Figs. 1 and 2 ofthe drawings. This bolt 4 is secured in the clamp member supporting brackets 4g which are secured on opposite ends of the shiftable clamp membielifli and are pivotally mounted on the eccentric pins 30, as shown best in Figs.3, i and 5 of the "drawings; 3 The bolts 4h screwthreaded in the 'endsxM of the shiftable clamp member 4 maintain the rigid connected relation of the I11. are positioned. between the .frame members Land? on theQbolts -la, as shownl' bestyin' Fi g's, 1 and3 oi thedrawings; It will be noted that the opposite endsof my sheet metal brake, are I duplicate and that each end of; the sheet n etal br e iwu per drb frame me be L nd 2 clamp member supporting brackets 4g withi the tubulargmeniber. 4b, The clamp member supp t g brackets' lg being mountedon the eccen;

t'ric pins. 30 atopp site ends, of the shiftable clamp member 4 are readily adjustable;forwardly and "ba'ckwardly providing a relative adjustment 7 of the forward edge of the shiftable-clamp meme ber 4 with the edgeportionl3c of thestationary V clamp member S itlbeing noted that the. eccen-f revolve the eccentric pin 30 for use in shifting which are secured inv spaced relation toeach other as shown -bestin Fig.1,1 of the drawings;

, ,Thestationary. clamp member 3 is securedat its oppositeends intermediate'the"irame mema a bers Z preferablybywelding, but may beotherg wise'secured between-these frame mempgerfiwl at its oppositeendsqgThis stationary clamp memberflisprovided' with a substantially horizontal plate po'rtion3a,,as shownbest in Fig. 2 of [the drawings and integral with ;this' horizontal por- I tion 3c; is f an upwardly and'angularly extending por-tion'3b ontheeXtending-end of which is pQSi-F tioned aclarnpbrakihgedge member 31;. I Secured ion the undersideof'thiS edge member 30 is an the: shiftableclamp member 5 backwardly and forwardlylas hereinbefore described; It will be noted; that the outwardly extending ends of. the i eccentric jpins-Sfigare held in spring tensional engagement with the clamp member adjustinglever 28 by mean'soithe tension spring Mia-which is secured on on ejof thevbolts, la projectingout-g wardly from the side ofthe frame 'rnember l as shown best in Fig 1 ofthe drawings Inter: connecting the'c 'lanip member supporting .bracke etsifigand the clamp member operating. lever I8. isthe link I Qperatively;connected with theclamprnember operatinglever I8 is the clamp memberloperating lever 11 which is'arranged V .for use in forcing the shiftableclamp members;

inwardly and'downwardly extending portion 311 'which i s' supported and bracedzat its opposite e dsby the s b t i l t an u r a e rtions .36 which are secured on-t e inner side of the framemembers 2 in angular relationwith each other havingtheir. upwardly'extending ends securedto the lower edge ofthe portion jisdby welding'or'otherwise. lntegralwith the horizontalportion 3a oi the stationary clamp member 3 ,are forwardlyrand downwardly extending I portionsjf positionedp'at oppositeends ot the t Jforwardlyl and upwardly extending portion3b asshovvn best in Figs. land 2 of the drawings. ,7 I The shiftable clampjmember 4 is provided with a substantially triangular in cross sectionolamp portion 4a,,tlie base of which is welded or other-' wise secured to atubular member 4b,'as shown I best in Figs; 1 and 2 of the drawings. This tubu- Q Jarmember. was arranged in coextensive rela- 't omw h cl rt on, M 9 the e iabl downwardly intoengagement with the stationary clamp-member 3 by'means of pressure exerted-by a personsifoot on the pedal-portion l'laof said operating lever H, a lshown best 3 of thedrawings.

Thelbrake member 5 i s -gprovided I larlywdispo sed members 5a and-"5b whichvare ded or oth rwi red t atu u ar member 50 which i s arranged in coextensive relationwith t e .b akem m-be 5-,"The e Po ti s 5d a d 15b are preferably secured together by welding or otherwise at 501 and the brake edge memberje I is seeured onthe upwardly extending end portion I 5fof the portiongEb} by;means;of the screws, 5y

as shownbest in Fig. lot the drawings.

S ecured on oppositeends of the tubular mem ber ecare thebrake member rocker arms which 1 are supported ontherocker arm bearings I and {which are secured to theirame memb er i ,'as

shown best in Figs. 1 and 6 of the drawings. The rocker arrnbearings l and 8 areeaeh supported eji lec ent tj haitla h c is a ran ed to be members 20 and 2|, as shown best inFig. 3. ofthe drawings. .A bolt 21b is eccentrically mounted'be tween the frame memb'ers'l and 2 and -is ar: ranged to support one side edge of the clamp fastening member 20 near its pivotal connection with the clamp fastening memberZl, as shown be'stin Fig.3 ofthedrawings.

Thefastening member controllever. 22 is rigidly connec-ted with the control shafti25 and is atranged for use inmanually shifting theclamp lized as the braking edge ofthe brake member A.

whereby the relatively wide edge D may be liti- It will befurther noted that themembers E and F of. the brake memberA are supported and secured: together near their extending ends by meansgof' a spacermember. G which is welded or, 7 otherwise secured between. the members'E and Ei providing alchannel portion ll-fin the brake fastening members and 21 into the dash line position, as shown in Fig. 30f the drawings'after the latch member 16' has been released by the latch member control lever 23 in connection with the latch memberli. It will be. noted that the rocker arm operating. gears 10 cannot mesh with .the rocker arm gear rack 9 when the shiftable clamp member 4 is in-spaced relation with-the stationary'c-lampmember 3 and it will be further noted that the'shiftablezclamp member 4 cannot be 'openedrelatively with'the stationary clamp T member 3 until the rocker arm operating gears I!) have been disengaged from the rocker arm gear'racks 9. j a

Thecontrol shafts 24 and 25 extend from one end of my sheet metal brake to the other end so that the operator of my sheet metal brake can control the entire mechanism fromone end thereof' by means of the clamp member-operating levers H, the fastening membercontrol' lever 22, i and the'latch member control lever 23, asshown bestin Fig. 1 of the drawings. The end portions 5hofthe brakemember 5 are positioned in considerablespaced relation from the frame member -2' permitting the passage of relatively "wide flange portions ofmetal'through the space'A intermediate said end portions 59 and the frame I member 2, as ings'. 1

' The metal supporting" member 3|, as shownv shown best in Fig. l of thedrawv i best in Fig. Zof ;the drawings ispositioned on the upper side oftheinclined portion 3b of the stationary clamp members andis arranged to jsupport metal behind the edge member 3c of said I stationary clamp member 3.; This .metal supporting member 3! is'espe'cially adapted for'use in supporting relatively narrow strips of metal which tend tofallfbackwardly behind the braking edge 30 when positioning saidlnarrow strips of metal in the brake for bending the "same."

'7 It will be'notedfthat the shiftable clamp member 4 is arranged to be'pivotally'shifted onthe 1 bolts 4e so that the pan forming 'members' 401 assumes the position of the clamp portion 4a.

It will be noted, however, that the pan forming portions Ad must be removed from the track portions 40am the bolts 4h in the shiftable clamp member supporting brackets 4g" must be removed *sothat the tubular member- 41) may be revolved infa counter clockwise direction substantially 180, as shown in Fig. 2 of the drawings." The bolts Harare then replaced and tightened down and-the pan forming portions 4d may be placed on the track portions lc in substantially the posi -tion of the clampportion 4a,' as shown best. in

rig. 2' or the drawings.

*Ihthe' modifiedstructure, as shown inj-Fi'gs; 9,

' *10 -and ll, ;I have provided a br'akem ember A which is arranged" tosupport a removable .edge member B which-is provided. with anf angular member A for supportingthe'ledgemember B in various positionstherein, as shown in Flgs. 9 and 1010f the drawings. This edge memberB is arranged to be shifted longitudinally in the channel portion'I-l and thischannel portion H is l I arranged to receiverelatively short edge members J which are substantially .the cross sectional shape as the edge member Band theseedgemembers J, as shown'inFig. not the drawings,are also longitudinally'shiftable in the channel porti-onI-I and are arranged to brake portions of 'metal upwardly when it'is desired to brake out r a 'p'ortion'intermediate or at the ends of a pieceof metal positioned between the clamp members L and M. The clamp'mem-berL is provided with a hardened edge member N'for use in bending stainless steel or the like.

Though-I have shown and described a partic Patent is: a

1. In a sheet metal brake of the class described', the' combination of a brake member,

a circularin cross section tubular member con-. nected longitudinally therewith substantially the I full'length of said brake member, andarcuate rocker arms secured to opposite ends of said tubular memberoutwardly orthe ends of a .brake member. r f

'2. Ina sheet metal brake of the class 'described, the combination of a brake'member, a

circular in crosssection tubular member connected longitudinally therewith substantially the? 'full length of said brake' n'iember, arcuate rocker arms'secured-to opposite ends of said tubular,

member outwardly of the ends 'of said brake member, 5' and roller bearings-engageable with arcuateiportions of saidrocke'r' arms and supporting said rocker arms.- r 3. In ,asheetv metal brake of the class described, the combination of a brake member, a

tubular me'mber'connected longitudinally therewith, arcuate rocker arms secured to opposite ends of said tubular member, bearings engage- "able-with' arcuateportions'of'said rocker arms,

a a shiftable clamp member, a'tubular member relatively narrow'edge portion C-at its; one side i and relativelylwide edgeportion D at its other side; It will be noted that theseedges' C and D may bereversed in their relation with the brake membe'r' Ayasshown' in Fig. 10 0f the drawin s,

connected longitudinally' therewith and in cooperative relation with said brake member, said shiftable clamp member provided with track 5 members portions and pan forming clamp mounted on saidtrack portions. i

Y 4. Ina sheet metal brake of the class cle scribed, the combination 'of arcuate rocker arms,

a brake member rigidly connected therewith,' gear racks connected with'the arcuateportions of said rocker arms, rocker arm operating gears arranged to mesh with said gear racks forshifting said rocker arms, control leverand latch means arranged in connection with said rocker engaging said eccentricapins 2,325,736 '7 arm operating gears for shifting said rocker arm operating gears in and out of mesh with said.

gearracks on said rocker arms, clamp member (operating levers, a shiftable clamp member connected therewith said clampmember operating levers incooperative relation-with said control lever and latch means, whereby said rocker arm operating gears are out of "engagement with said seal racks when said shiftable clamp member is in openposition; i

5. In a sheet metal brake of "the class he scribed, the combination of a shiftable clamp member, eccentric pins arranged to form pivotal supports for said shiftable clamp member, a clamp member adjusting lever inconnection with each of said eccentric pins, frame membersarranged to support said shiftable clamp member and secondary clampmember adjusting levers engaging" said eccentric pins and pivotally mounted on ,said frame members for shifting Said: shiftable clamp member forwardly and backwardly relatively with said frame members.

6. In asheet metal brake ,of the class described, the combination of i a shiftable clamp ,member, eccentric pins arranged to form pivotal {supports for said shiftable clamp member, a! clamp memberadjusting lever in connection-with jeachof said eccentric pins, frame'members ar- ,ranged to support said shiftable clampmember,

secondary clamp member adjusting levers engaging said eccentric pins and pivotallyrnounted on i said frame members 'for'shifting said shiftable clamp member forwardly and backwardly relatively with said frame members,said clamp A member providedwith supporting bracket mem- 1 bers arrangedto support thefoppositeends of, said clamp member in spaced relation with said frame-members. 1 i '7. In a sheetmetal ,brakeof the class described, the combination of a shiftablefclamp membeneccentric pins arranged to form pivotal supports for said shiftable clamp member, frame members arranged to .support. said shiftable a clamp member, clamp member adjusting levers v and \pivotally mounted on said frame {membersfor shifting said ,shiftabIe clamp member? forwardly and backwardly relatively with said frame members,

said clamp member provided with supporting bracket members arranged to support the opposite ends of said clamp member inspaced relation with said frame members, said shiftable clampmember arranged to be pivotally shifted onsald supporting bracket members and provided with opposed exchangeable clamp portions.

8.,In a sheet metal brakeflof the class described, the cornbinatiori,of a shiftable clamp member, eccentric pins arranged to form pivotal -supportsfor said shiftableclampmember, frame members arranged to. support said shiftable clamp member, clamp member adjusting levers engaging saideccentric pins and pivotally mounted on said frame members for shifting said shiftable clamp member forwardly and backwardly relatively/with ,said frame members,

said clamp member, provided with supporting bracket members arranged to support the opposite ends of said clampmembers in spaced relationfwith said frame members, said shiftable clamp member arranged to be pivotally, shifted onisaid-supporting bracket members and proconnection with saidrroc ker arm operating gears,

vided with opposed exchangeable clamp portions, and track portions; of said shiftable clamp member arrangedto support one of said opposed clamp portions? 1 Q9, In a sheet metal brake of the class. described, the combination of arcuate rocker arms,

a brake member secured thereto, said rocker arms provided with recessed arcuate channel portions, bearings engageable therewith in said arcuate recessed channelv portions, frame. mem- 1 bers at one side of each of said rocker arms arranged to support said bearings and adjustable means inconnection withsaid frame members arranged. to support said bearings.

10. In a sheet metal brake of theclassde- V scribed,,the combination'of arcuate rocker arms, a brake member secured thereto, said rocker arms provided wtih recessed arcuate channel portions, bearings engageable therewith in said arcuate recessed channel portions, frame members, arranged tosupport said bearings, gear I racks on said rockerarms, rockerarm operating gears in mesh withsaid gear racks, a geardisengaging member in connection with said" rocker 25 arm operating gears and angularly adjustable arms arranged toengag'e said gear disengaging member for forcing saidfrockerarm operating l gears out of meshwith said gear racks on said" rocker arms. 7

12. In a sheet met'albr'ake ofthe' class de-{ scribed, the co mbination of arcuate rocker arms, a brake member secured thereto,said rocker V arms provided ,with, recessed arcuate channel 7 portions, bearings engageable therewithin saidarcuate recessed channel portions, frame mem bers arranged tonsupport said bearings, gear racks on said rocker arms, rocker arm operating gearsin mesh with said gear racks, a gear disengaging member in connection with said rocker arm operating gears, and rocker arm clip members arranged to engage said gear disengaging member for forcing said'rocker arm operating 7 j gears outof'mesh with said gear racks on said rockerfarms at any predetermined point.

. 13; In a sheet metal brake, of the class de scribed, the combination of arcuate rocker arms,

a brake member securedtheretasaid rocker armsprovided with arcuate portions, bearings engageable therewith, frame members arranged to supportsaid bearings, gear racks on said rock er arms, rocker arm operating gears in mesh with said gear racks agear disengaging member in a portion of said rocker arms arranged to engage said gear disengaging member for forcingfsaid rocker arm operating gears out of I mesh. with said gear racks on saidrocker arms. 7

SAMUEL BOWMAN. 

